That's what Amtrak does for Thanksgiving, the busiest period of the year for them. Basically they cancel all maintenance, try to have almost no cars in the shop for mandatory inspections, etc. Yes, no matter what there are always some cars still in the shop, but that number is far lower than at any other point in the year.If I understand right, they are able to push every car in their fleet into service by deferring maintenance and pushing inspection schedules around so as to not have any in the shop during the holiday pinch?
And it would be an awful waste of money to have all those cars just sitting around much of the time. Cars that they'd most likely be paying off loans on.To have spare cars just "sitting" around to be hitched up on short notice to a train because demand went to Jupiter would be awesome, and it would also mean that trains like the LSL could have as many as 10 Viewliner sleepers hitched into the consist because they continued to sell out of rooms at only nine sleepers.
I'm not saying that it wouldn't be nice to have a small surge fleet, but it is a fine line that one must walk too. A car that gets out on the road less than 100 times per year is a car that Amtrak probably shouldn't own.